Metal split pulley.



N. BARRY.

METAL SPLIT PULLEY.. APPLICATION FILED FEB. I8, |914.

1,228,024. I Patenteupr. 17,1917.

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En saperne Parana" onirica.

COMPANY, or MUscArINE, rows, n

CORPORATION OF IOWA.

METAL `SPLIT PULLEY.

Specification of Letters Patent.

Patented Apr. 17, 1917.

Application filed February 18, 1914. SeriaI No. 819,554.

To all whom t may concern.'

Be it known that. I, NICHOLAS BARRY, a citizen of the United States,residing vat Muscatine, in the county ofl Muscatine and State of Iowa,have invented certain new and useful Improvements in Metal SplitPulleys; and I hereby declare that the fol.- lowing is a full, clear,and exact description thereof; reference being had to the accompanyingdrawings, which form part of this specification.

This invention relates to metal split pulleys, and its object is toproduce an all metal split pulley which can be economically made ofsheet metal, andwhich will 'be light and strong, and 'can be readilyattached to and detached from shafts.

One pulley embodying the invention is illustrated in the accompanyingdrawings, and the invention will be explained in detail with referenceto such drawings, to enlable others to manufacture and use such pulleys.The essential features of the invention and novel combinations of partsfor which protection is desired are summarized in the claims.

In said drawings: 4 j

Figure l is a side view of the complete pulley attached to a shaft. A

Fig. 2 is an enlarged sectional view on line 2 2, Fig. 1. f

Fig. 3 is an edge view thereof partly broken.

Fig. 4 is a' detail section, looking downward, on line 4%, Fig. l. j

Fig. 5 is a view of a circular bushing detached. j v

The present invention relates more particularly to small pulleys, andhasespecial reference to the means Afor clamping the pulley sectionsupon the shaft; but the novel clampingV members are adaptable for usewith large pulleys.

As shown inA Fig. l the pulley is composed of two opposite similarsections each consisting of a semi-circular rim member l and atransverse clamping member 2 which connects the endsof the rim memberand also forms part of the means for clamping or securing the pulleyupon a shaft.

The rim member l of each pulley section is preferably stamped out ofsheet metal, and bent in semi-circular form. Each rim member ispreferably provided withV one or more internal circumferential ribs'la,

formed by. bending .the metal longitudinally upon itself, as shown, andthe walls `of such bends are preferably pressed close so'that the outersurface of the together, rim section is substantially smooth; and suchrib la materially stiffens the rim section. The side edges of the rimsection are preferably provided with inwardly projecting flanges lb.This construction makes a strong rim with a fullcomplete contactsurface. lAfter, the rim members are formed they are preferablydipped'yinl molten tin,

or galvanized, to fill the crevices and make the surfaces of the memberssmooth, and to firmlyv unite or solder'the sides of the bends 1atogether..

The opposite ends of each rim member are connected by a transverselydisposed clamp and spoke member 2, which is preferably also formed ofsheet metal, stamped into the form shown in Figs. 1 and 2. Each clampmemberv has its central portion 2a bent to partially surround the shaft,and in the example sh'own'inllig. l this portion 2a is polygonal; and ateach side of this cenv tral portion 2a Vand extending outwardlytherefrom isa ,web orspoke portion 2b, the outer ends of such; spokeYportions are bent to fit closely against the inner surfaces of the endsof the rim member 1,'and are secured thereto by suitable means,preferably by welding lthe members together at such .points as indicatedat fw.

One end 2e of each clamp member is made Vto project or extend beyond theadjacent end of the rim member, as indicated vin Fig. l; and theotlierend of the 'clamp member is provided with a bayonet-'shaped projection2f; so when the pulley sections are placed together the projecting end.2e of one clamp memberengagesv the bayonet-shaped end 2t of the otherlclampy member and forms a strong interlocked close joint between the'ends of opposed pulley sections, while the ends of the rim members .1of'such sections abut closely together at such joints, see Fig. l, andthe exterior lsurface of ythe pulley is smooth and practically unbroken.

The projectingl portions 222'?Y 'of the ends of the clamp members areslotted as at 2c to accommodate the ends of the bent ribsv 1a of the rimmembers when the pulley sections are fastened together to make thecomplete pulley; and the interlocking ribs and slots help to preventrelative lateral displacement of the pulley sections longitudinally ofthe shaft.

The spoke portions 2b of the clamp members are perforated securing bolts4L. Preferably instead of having these bolts arranged parallel to theplane of the pulley the bolts lare set at opposite angles thereto andfor this purpose one spoke each other, as indicated ln Figs. l and 2,.and

vwhen so arranged itwill be seen that4 the bolts can be readily engagedby la wrench or screw-driver fromthe side of 'the pulley without havingto perforate the rims.

Heretofore, so far as I am advised, small split pulleys have been madewiththeclamp screws or bolts running straight through the bushing or thearms, and perpendicular to the shaft. This necessitated cutting. holesthrough the rim of the pulley, in order to get at such screws or bolts;with a screwdriver or wrench. Such openings are dangerous as personsmight puttheir. hands on the pulley and their fingers be caught in suchholes. Not only are such holes dangerous when in the face of the.pulley, but they lessen the belt contact, as such holes are from to 1inch in diameter and on. a pulley three inches wide, at thel pointswhere such holes are cut in the rim practically or more .of the contactsurface is lost.y In inypulley the clamp screws being set at an anglethe rim of the pulley `is continuous and .without holes.

The boltszmay be secured by nuts-l"1 which are preferably placedon theinner ends of the boltsadjacent thebosses 2h, and in this position thenuts, if square, abut against the rib la and are locked, see Fig. a.

The central portions 2a of the-clamp inembers are adapted to lit over aremovable split bushing 3, the parts of which are exteriorly shaped toit in the portions Qa, and are internally bored to it the shaft S onwhichthe pulley is mounted. The split bushings 3 are removable, andinterchangeable, so that the same pulley can be fitted to differentsizes of shafting by providing it with a suitably sized bushing. I/Vhilethe-central portions Qaof the clamp member are preferably bent intopolygonal shape, as shown in Fig. l, and the bushings similarly shaped.exteriorly, such parts might be of other shape, for-example,semi-circular, in which circular bushings would .be employed, asindicated.- in F ig. 5.

for the passageof the` .indicated at fw and any By means of thesebushings the pulley sections can be readily fastened on a shaft. rIhepolygonal-shape of the central portions of the-clamp members andbushings as shown in Fig. l prevents the pulley slippingcircumferentially on the bushing. The bolts are applied at each side ofthe bushing and securely clamp the pulley in position upon the-shaft.

I preferably dip the completed pulley halves into molten tin, orgalvanize same, to

,protect themagainst rust and to firmly unite the sides-ofthebends'andffill up any crevices left at the bends or joints where theparts might nothave been welded. Custoinarily electricwelding iseffected only in spots as slight crevices left between the unwelded.portions will be filled by the tin or zinc, and thus insure closejoints and prevent looseness.

The split bushings moreover, instead of being-made the samethicknessthroughout, are preferably channeled at the centers as indicatedat 3aand provided with interior flanges don their ends which are adapted toengageV the shaft, and these-flanges may be axially slottedas shawn atl3 so as to enable-the bushings to. be. axially contracted upon the shaftwhen the clamps are tightened.`

Bushings `for Imetal pulleys4 are usually bored .out slightly largerthanthe shaft on which they areto. be clamped, and owing to slightvariations in the size of the shafting, an allowance of about..005 yofan inch over or under is made. My bushings can be bored out the exactsize of the shaft; and if the shafting isslightl-y over size the. slots3C enable the bushing tobe expanded to fit the shaft; if the shaft "isover size the-bushing can expand slightly; if the shaft is under sizeVthe bushing can contract slightly; this is a great practicalconvenience, as much troublein the use of split pulleys is due to thebushings slipping on the shaft.

What I claim is:

l. The herein described split-pulley having. two similar sections; eachcomprising a rim member-having a circumferential bend anda spoke memberhaving its ends fasi tened to the ends ofthe rim member and having acentralportion bent to fit over a bushing and provided with inclinedprotuberances at opposite lsides of said central portion, the-ends ofthe spokemember projecting beyond .the-ends of the rim member andadapted to interlock with the ends of a similar spoke vmember on theopposed pulley section-f; together with'bolts vengaging said'protuberances and arranged at an angle to eachother and to the face ofthe pulley; and bushings; adapted to be. interposed betweenthey bentportions of the spoke members and-a shaft.

2.. A split-pulleyy section :comprising a rim member, a spoke-and-elampmemberv jecting beyond that end of the rim member to which it isattached and the otherl end of the spoke member extending beyond thatend of the rim member to which it is attached and its projecting endbeing bent into bayonet-shape; the bayonet end of such spoke memberbeing adapted When assembled With a like pulley section to engage theprojecting end of an opposed spoke member, While the ends of the opposedrim members abut, substantially as described.

3. In combination, opposite split-pulley sections having inclined bosseson their opposed faces, and straightV fastening bolts engaging saidinclined bosses said bolts lying at angles to the sides of the pulleysections so as to be accessible from the sides thereof, substantially asdescribed.

4. In combination, opposite split-pulley sections having inclined bosseson their opposed faces, and straight fastening bolts engaging saidinclined bosses and uniting said sections, said bolts lying at angles toeach other and to the sides of the pulley sections so as to beaccessible from the sides thereof, substantially as described. v

5. In a split-pulley the combination of opposite pulley sections; eachcomprising a rim member; a clamp-and-spolre member connecting the endsof the rim member and having a central portion adapted to engage asuitable bushing and also having inclined perforated bosses at oppositesides of the central portion; and inclined clamping bolts engaging saidbosses, substantially as described.

6. In a split-pulley the combination of opposite pulley sections; eachcomprising a rim member; a clamp-and-spoke member connecting the ends ofthe rim member and having a central portion adapted to engage a bushingand inclined 4bosses at opposite sides of the central portion; bushingsin the central portion, and straight fastening bolts engaging saidbosses and arranged at angles to the face of the pulley to permit accessthereto from the sides of the pulley.

7. The herein described split-pulley composed of tWo similar sections;each comprising a rim member having a circumferential bend and a spokemember having its ends fastened to the ends of the rim member andVhaving a central portion bent to lit over a suitable bushing andprovided With in- Copes of this patent may be obtained for ve centseach, by addressing'l the Commissioner clin'ed perforated bosses;together With angularly disposed fastening bolts engaging said bossesand arranged at an angle to each Y other and to the faces of the pulleysections,

substantially as described.

8. In a splitgpulley, opposite pulley sections each comprising a rimmember, a spolre-andclamp member having its ends united to the ends ofthe rim member, one end of said spoke member projecting beyond that endof the rim member to Which it is attached and the other end of the spokemember extending beyond that end of the rim member to which it isattached and its projecting end being bent into bayonetshape; thebayonet end of such spoke member being adapted to engage the projectingend of the opposed spoke member, While the ends of the rim members abut;together with straight securing bolts arranged at angles to each otherand to the sides of the pulley and passed directly through said spokemembers, substantially as described.

9. In a metal split-pulley, opposite sections each comprising a rimmember having a circumferential bend and side flanges; and a clampmember having its ends bent and attached to the ends of the said rimmember and its central portion bent to receive a suitable bushing, andprovided with openings for thev passage of bolts at opposite sides ofthe central portion; with pairs of straight bolts arranged at angles toeach other and to the sides of the pulley and engaging the openings inthe clamp members to clamp the sections together.

l0. In a split-pulley, two similar sections; each comprising a rimmember and a spoke member fastened to the ends of the rim member andhaving a central portion bent to fit over a bushing and its endsprojecting beyond the ends of the rim member and adapted to interlockthe opposed ends of a similar spoke member; together With pairs ofstraight bolts engaging said spoke members and arranged at angles toeach other and to the face of the pulley, and bushings interposedbetvveen the bent portions of the spoke members and the shaft.

In testimony that I claim the foregoing as my own, I alix my signaturein presence of tWo Witnesses.

NICHOLAS BARRY.

W'itnesses:

AGNES FULLER, E. SMITH.

of Patents,

Washington, D. C.

